Go with the "h.264" version.
Archive.org didn't feel like telling us what the difference is between the 2 mp4 versions here is, so I downloaded them both to find out. Here's the answer. The 512 version is 320 x 240, & the
h.264 version is 640 x 480. There is (almost) NO difference in the level of DETAIL that you'll see when you play them, so don't let the low resolution keep you from getting the 512 version.
The truly disappointing thing about this is the EXTREMELY BLUE tint that it has. That could easily have been fixed if somebody had just used "Auto tone" on this before uploading it. Instead, this version gives us all some sympathy with those who have color blindness.